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Listen Again: Breathe
TED Radio Hour
The Blood Air Barrier in Birds
In mammals, the lung is a giant flexible bag. It can't be too thin or it'll break. Birds have done the opposite approach. Air passes through the lung, but the lung does not expand or contract. The lungs are locked into place by a series of forked ribs. Also in many species of birds, extension arise from the lung and the air sacks,. They lock the respiratory system into place....
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